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TPS3707 Datasheet(PDF) 2 Page - Texas Instruments

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Part # TPS3707
Description  PROCESSOR SUPERVISORY CIRCUITS WITH POWER-FAIL
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS3707 Datasheet(HTML) 2 Page - Texas Instruments

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TPS3705xx
TPS3707xx
PROCESSOR SUPERVISORY CIRCUITS WITH POWERFAIL
SLVS184C − NOVEMBER 1998 − REVISED DECEMBER 2005
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description
The TPS3705, TPS3707 family of microprocessor supply-voltage supervisors provide circuit initialization and
timing supervision, primarily for DSP and processor-based systems.
During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the
supply voltage supervisor monitors VDD and keeps RESET active as long as VDD remains below the threshold
voltage VIT+. An internal timer delays the return of the output to the inactive state (high) to ensure proper system
reset. The delay time, tdtyp= 200 ms, starts after VDD has risen above the threshold voltage VIT+. When the supply
voltage drops below the threshold voltage VIT– , the output becomes active (low) again. No external components
are required. All the devices of this family have a fixed-sense threshold voltage VIT– set by an internal voltage
divider.
The TPS3705-xx and TPS3707-xx devices incorporate a manual reset input, MR. A low level at MR causes
RESET to become active.
The TPS370x-xx families integrate a power-fail comparator which can be used for low-battery detection,
power-fail warning, or for monitoring a power supply other than the main supply.
The TPS3705-xx devices have a watchdog timer that is periodically triggered by a positive or negative transition
at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval,
tt(out) = 1.6 s, WDO becomes active. This event also reinitializes the watchdog timer. Leaving WDI unconnected
disables the watchdog.
The TPS3707-xx devices do not have the Watchdog function, but include a high-level output RESET.
The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in
either 8-pin MSOP or standard SOIC packages. The TPS3705, TPS3707 devices are characterized for
operation over a temperature range of −40
°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
THRESHOLD
VOLTAGE
SMALL OUTLINE
(D)
POWER−PAD
µ-SMALL OUTLINE
(DGN)
MARKING DGN
PACKAGE
CHIP FORM
(Y)
2.63 V
TPS3705−30D
TPS3705−30DGN
TIAAT
TPS3705-30Y
2.93 V
TPS3705−33D
TPS3705−33DGN
TIAAU
TPS3705−33Y
4.55 V
TPS3705−50D
TPS3705−50DGN
TIAAV
TPS3705−50Y
−40
°C to 85°C
2.25 V
TPS3707−25D
TPS3707−25DGN
TIAAW
TPS3707−25Y
−40 C to 85 C
2.63 V
TPS3707−30D
TPS3707−30DGN
TIAAX
TPS3707−30Y
2.93 V
TPS3707−33D
TPS3707−33DGN
TIAAY
TPS3707−33Y
4.55 V
TPS3707−50D
TPS3707−50DGN
TIAAZ
TPS3707−50Y


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